3.4.1: LTO warnings

[kloczek]

Looks like some declarations in header files are not matching with those in .c files:

libtool: link: g++  -fPIC -DPIC -shared -nostdlib /usr/lib/gcc/x86_64-redhat-linux/10/../../../../lib64/crti.o /usr/lib/gcc/x86_64-redhat-linux/10/crtbeginS.o  -Wl,--whole-archive resample/.libs/libresample.a arithmetic/.libs/libarithmetic.a colour/.libs/libcolour.a conversion/.libs/libconversion.a convolution/.libs/libconvolution.a foreign/.libs/libforeign.a freqfilt/.libs/libfreqfilt.a histogram/.libs/libhistogram.a draw/.libs/libdraw.a iofuncs/.libs/libiofuncs.a morphology/.libs/libmorphology.a mosaicing/.libs/libmosaicing.a create/.libs/libcreate.a -Wl,--no-whole-archive  -lMagickCore-7.Q16HDRI -L/usr/lib -limagequant -ltiff -ljpeg -lgthread-2.0 -lgmodule-2.0 -lexpat -lpangoft2-1.0 -lpango-1.0 -lharfbuzz -lgsf-1 -lxml2 -lfftw3 -lorc-0.4 -llcms2 -lgif -lrsvg-2 -lgio-2.0 -lgdk_pixbuf-2.0 -lniftiio -lznz -lpoppler-glib -lcairo -lgobject-2.0 -lglib-2.0 -lpixman-1 -lfontconfig -lfreetype -lpng16 -lxcb-shm -lxcb -lxcb-render -lXrender -lX11 -lXext -lIlmImf-2_4 -lImath-2_4 -lHalf-2_4 -lIex-2_4 -lIexMath-2_4 -lIlmThread-2_4 -lGLU -lGL -lopenslide -lcfitsio -lwebpmux -lwebpdemux -lwebp -lmatio -lhdf5 -lz -lexif -L/usr/lib/gcc/x86_64-redhat-linux/10 -L/usr/lib/gcc/x86_64-redhat-linux/10/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/usr/lib/gcc/x86_64-redhat-linux/10/../../.. -lstdc++ -lm -lc -lgcc_s /usr/lib/gcc/x86_64-redhat-linux/10/crtendS.o /usr/lib/gcc/x86_64-redhat-linux/10/../../../../lib64/crtn.o  -O2 -g -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -flto=auto -flto-partition=none -Wl,-z -Wl,relro -Wl,--as-needed -Wl,-z -Wl,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -flto=auto -flto-partition=none -fuse-linker-plugin -pthread -Wl,--export-dynamic -pthread   -pthread -Wl,-soname -Wl,libvips.so.42 -o .libs/libvips.so.42.12.1
mosaicing.c:98:13: warning: type of 'vips_merge_get_type' does not match original declaration [-Wlto-type-mismatch]
merge.c:66:1: note: return value type mismatch
merge.c:66:1: note: type 'GType' should match type 'int'
merge.c:66:1: note: 'vips_merge_get_type' was previously declared here
merge.c:66:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
mosaicing.c:99:13: warning: type of 'vips_mosaic_get_type' does not match original declaration [-Wlto-type-mismatch]
mosaic.c:79:1: note: return value type mismatch
mosaic.c:79:1: note: type 'GType' should match type 'int'
mosaic.c:79:1: note: 'vips_mosaic_get_type' was previously declared here
mosaic.c:79:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
mosaicing.c:100:13: warning: type of 'vips_mosaic1_get_type' does not match original declaration [-Wlto-type-mismatch]
mosaic1.c:433:1: note: return value type mismatch
mosaic1.c:433:1: note: type 'GType' should match type 'int'
mosaic1.c:433:1: note: 'vips_mosaic1_get_type' was previously declared here
mosaic1.c:433:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
mosaicing.c:101:13: warning: type of 'vips_match_get_type' does not match original declaration [-Wlto-type-mismatch]
match.c:117:1: note: return value type mismatch
match.c:117:1: note: type 'GType' should match type 'int'
match.c:117:1: note: 'vips_match_get_type' was previously declared here
match.c:117:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
mosaicing.c:102:13: warning: type of 'vips_globalbalance_get_type' does not match original declaration [-Wlto-type-mismatch]
global_balance.c:1728:1: note: return value type mismatch
global_balance.c:1728:1: note: type 'GType' should match type 'int'
global_balance.c:1728:1: note: 'vips_globalbalance_get_type' was previously declared here
global_balance.c:1728:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
morphology.c:135:13: warning: type of 'vips_morph_get_type' does not match original declaration [-Wlto-type-mismatch]
morph.c:77:1: note: return value type mismatch
morph.c:77:1: note: type 'GType' should match type 'int'
morph.c:77:1: note: 'vips_morph_get_type' was previously declared here
morph.c:77:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
morphology.c:136:13: warning: type of 'vips_rank_get_type' does not match original declaration [-Wlto-type-mismatch]
rank.c:88:1: note: return value type mismatch
rank.c:88:1: note: type 'GType' should match type 'int'
rank.c:88:1: note: 'vips_rank_get_type' was previously declared here
rank.c:88:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
morphology.c:137:13: warning: type of 'vips_countlines_get_type' does not match original declaration [-Wlto-type-mismatch]
countlines.c:72:1: note: return value type mismatch
countlines.c:72:1: note: type 'GType' should match type 'int'
countlines.c:72:1: note: 'vips_countlines_get_type' was previously declared here
countlines.c:72:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
morphology.c:138:13: warning: type of 'vips_labelregions_get_type' does not match original declaration [-Wlto-type-mismatch]
labelregions.c:57:1: note: return value type mismatch
labelregions.c:57:1: note: type 'GType' should match type 'int'
labelregions.c:57:1: note: 'vips_labelregions_get_type' was previously declared here
labelregions.c:57:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
morphology.c:139:13: warning: type of 'vips_fill_nearest_get_type' does not match original declaration [-Wlto-type-mismatch]
nearest.c:81:1: note: return value type mismatch
nearest.c:81:1: note: type 'GType' should match type 'int'
nearest.c:81:1: note: 'vips_fill_nearest_get_type' was previously declared here
nearest.c:81:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:160:13: warning: type of 'vips_conv_get_type' does not match original declaration [-Wlto-type-mismatch]
conv.c:64:1: note: return value type mismatch
conv.c:64:1: note: type 'GType' should match type 'int'
conv.c:64:1: note: 'vips_conv_get_type' was previously declared here
conv.c:64:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:161:13: warning: type of 'vips_conva_get_type' does not match original declaration [-Wlto-type-mismatch]
conva.c:205:1: note: return value type mismatch
conva.c:205:1: note: type 'GType' should match type 'int'
conva.c:205:1: note: 'vips_conva_get_type' was previously declared here
conva.c:205:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:162:13: warning: type of 'vips_convf_get_type' does not match original declaration [-Wlto-type-mismatch]
convf.c:106:1: note: return value type mismatch
convf.c:106:1: note: type 'GType' should match type 'int'
convf.c:106:1: note: 'vips_convf_get_type' was previously declared here
convf.c:106:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:163:13: warning: type of 'vips_convi_get_type' does not match original declaration [-Wlto-type-mismatch]
convi.c:183:1: note: return value type mismatch
convi.c:183:1: note: type 'GType' should match type 'int'
convi.c:183:1: note: 'vips_convi_get_type' was previously declared here
convi.c:183:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:166:13: warning: type of 'vips_compass_get_type' does not match original declaration [-Wlto-type-mismatch]
compass.c:63:1: note: return value type mismatch
compass.c:63:1: note: type 'GType' should match type 'int'
compass.c:63:1: note: 'vips_compass_get_type' was previously declared here
compass.c:63:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:164:13: warning: type of 'vips_convsep_get_type' does not match original declaration [-Wlto-type-mismatch]
convsep.c:58:1: note: return value type mismatch
convsep.c:58:1: note: type 'GType' should match type 'int'
convsep.c:58:1: note: 'vips_convsep_get_type' was previously declared here
convsep.c:58:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:165:13: warning: type of 'vips_convasep_get_type' does not match original declaration [-Wlto-type-mismatch]
convasep.c:135:1: note: return value type mismatch
convasep.c:135:1: note: type 'GType' should match type 'int'
convasep.c:135:1: note: 'vips_convasep_get_type' was previously declared here
convasep.c:135:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:167:13: warning: type of 'vips_fastcor_get_type' does not match original declaration [-Wlto-type-mismatch]
fastcor.c:72:1: note: return value type mismatch
fastcor.c:72:1: note: type 'GType' should match type 'int'
fastcor.c:72:1: note: 'vips_fastcor_get_type' was previously declared here
fastcor.c:72:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:168:13: warning: type of 'vips_spcor_get_type' does not match original declaration [-Wlto-type-mismatch]
spcor.c:97:1: note: return value type mismatch
spcor.c:97:1: note: type 'GType' should match type 'int'
spcor.c:97:1: note: 'vips_spcor_get_type' was previously declared here
spcor.c:97:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:169:13: warning: type of 'vips_sharpen_get_type' does not match original declaration [-Wlto-type-mismatch]
sharpen.c:113:1: note: return value type mismatch
sharpen.c:113:1: note: type 'GType' should match type 'int'
sharpen.c:113:1: note: 'vips_sharpen_get_type' was previously declared here
sharpen.c:113:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:170:13: warning: type of 'vips_gaussblur_get_type' does not match original declaration [-Wlto-type-mismatch]
gaussblur.c:65:1: note: return value type mismatch
gaussblur.c:65:1: note: type 'GType' should match type 'int'
gaussblur.c:65:1: note: 'vips_gaussblur_get_type' was previously declared here
gaussblur.c:65:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:171:13: warning: type of 'vips_sobel_get_type' does not match original declaration [-Wlto-type-mismatch]
sobel.c:62:1: note: return value type mismatch
sobel.c:62:1: note: type 'GType' should match type 'int'
sobel.c:62:1: note: 'vips_sobel_get_type' was previously declared here
sobel.c:62:1: note: code may be misoptimized unless '-fno-strict-aliasing' is used
convolution.c:172:13: warning: type of 'vips_canny_get_type' does not match original declaration [-Wlto-type-mismatch]
canny.c:62:1: note: return value type mismatch
canny.c:62:1: note: type 'GType' should match type 'int'
canny.c:62:1: note: 'vips_canny_get_type' was previously declared here

Without fixing that LTO during linking automatically will be disabled.

[jcupitt]

OK, fixed. Thank you!